H2-1B4 was a domodroid in the service of Scarlet Bloodhawk.
H2-1B4, having been Scarlet Bloodhawk's possession for an extended period, knew about the bond between its owner and a Rebel who had requested Bloodhawk's assistance on multiple occasions. Around 0 ABY, Bloodhawk possessed a spaceport that included repair capabilities, and she employed a Ky'lessan known as Snake-Eyes. Snake-Eyes abducted Bloodhawk, confining her to her quarters, and assumed control of the spaceport. Snake-Eyes maintained H2-1B4's presence and fabricated a story that Bloodhawk was on leave.
At that moment, Bloodhawk's comrade returned, requiring ship repairs. Snake-Eyes notified the Empire of their arrival and intentionally damaged their vessel to impede their departure while feigning repairs. H2-1B4 detected the presence of the old friend and, at the risk of exposure, informed them of Snake-Eyes's betrayal and Bloodhawk's situation, imploring them to save its owner. H2-1B4 also volunteered its assistance in the rescue if required, and Bloodhawk was then freed. While escaping the spaceport, H2-1B4 aided Bloodhawk in fixing her friend's spacecraft, enabling their take-off.